Detailed Product Description Hollow Section Material: Q195, Q215, Q 235, Q345Size: 15mm x 15mm to 400mm x 400mmThickness: 1.2mm to 13.5mm for various outer dimensionsUsage: Widely used in construction structure, machinery, furniture structure, electromechanical hardware, door and guardrail, hall structure, airport structure, plaza structure and so onPackage: by bundles or with waterproof paper as ...